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Avoid an unnecessary call to allnodes_size(), which is linear.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61372 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-12-23 17:24:50 +00:00
parent 1578f8486d
commit e1dfc7da89
1 changed files with 11 additions and 8 deletions
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19
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
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@@ -68,20 +68,23 @@ static void CheckForPhysRegDependency(SDNode *Def, SDNode *User, unsigned Op,
/// This SUnit graph is similar to the SelectionDAG, but represents flagged
/// together nodes with a single SUnit.
void ScheduleDAGSDNodes::BuildSchedUnits() {
// During scheduling, the NodeId field of SDNode is used to map SDNodes
// to their associated SUnits by holding SUnits table indices. A value
// of -1 means the SDNode does not yet have an associated SUnit.
unsigned NumNodes = 0;
for (SelectionDAG::allnodes_iterator NI = DAG->allnodes_begin(),
E = DAG->allnodes_end(); NI != E; ++NI) {
NI->setNodeId(-1);
++NumNodes;
}
// Reserve entries in the vector for each of the SUnits we are creating. This
// ensure that reallocation of the vector won't happen, so SUnit*'s won't get
// invalidated.
// FIXME: Multiply by 2 because we may clone nodes during scheduling.
// This is a temporary workaround.
SUnits.reserve(DAG->allnodes_size() * 2);
SUnits.reserve(NumNodes * 2);
// During scheduling, the NodeId field of SDNode is used to map SDNodes
// to their associated SUnits by holding SUnits table indices. A value
// of -1 means the SDNode does not yet have an associated SUnit.
for (SelectionDAG::allnodes_iterator NI = DAG->allnodes_begin(),
E = DAG->allnodes_end(); NI != E; ++NI)
NI->setNodeId(-1);
// Check to see if the scheduler cares about latencies.
bool UnitLatencies = ForceUnitLatencies();